A Queensland farmer got the surprise of his life while collecting his chickens' eggs - discovering one hen had laid an egg three times the normal size.
Stockman's Eggs, where the discovery was made, posted about it on Facebook on Monday night.
"One of our free-range girls has been working overtime. Check out this whopper!" it wrote.
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"The average egg weighs around 58 grams and this beauty came in at 176 grams!"
That wasn't the only amazing aspect of the discovery either - when it was cracked open, another egg was inside, perfectly formed alongside a yolk.
Associate Charles Sturt University's Professor Raf Freire told ABC News it was mystery.
"To be honest, I don't really know how it's come about.
"It's not too unusual if a hen is very stressed. You sometimes see it in cages, where they retain that egg.
"They don't lay it, but behaviour just stops and the hen usually goes back to feeding."
The egg photo has proven a hit on Facebook, garnering hundreds of shares and new followers.